Stress testing:To verify the response time of the 
application by increasing or decreasing  the requests.

Load testing:To verify the response time of the application 
by sending concurrent users request at a time.

Stress testing:To verify the response time of the 
application by increasing or decreasing  the requests.
here applied on various load levels

Load testing:To verify the response time of the application 
by sending concurrent users request at a time.and also
performance is also tested here

Stress testing means increasing the load and checking the 
performance of the each level.
By giving abnormal values such as complex subquirs.by 
giving huge inputs.
By ret riving the data from the resource.

Load testing means it is a process of testing executing are 
running application by the clients are end-user.
For example the application is going to be tested 100 users 
so we have to test the application. By sharing the resource 
from server by the 100 users at a time.
== increasing the heavy load at time.